I have a housing custom made by Liquid Eye housing for sale. It was made for a Canon 1d MkIIN (but I have also got a 5dMKII in there.) It has a two stage pistol grip (so you can autofocus) and a dome port for a Canon 15mm fisheye lens.
Check out their website if you haven't heard of them: http://liquideye-whs.com. They do awesome housings. It has two dial controls so you can shoot fully manual when needed and has a zoom control for any zoom lenses. The housing is in good condition with a couple of small chips on the paint that don't effect the housing's performance at all.
The dome port has a couple of scratches on the port- I've shown the worst one. They don't effect the image really. The dome port also has a chip on the side where it had a knock once but this doesn't effect the performance at all. You can contact LiquidEye for any extra ports you need etc, they're really helpful and easy to work with.
Selling as I never get out in the water any more unfortunately. Any questions please ask. Anyone is welcome to have a look at it, I'm based near London.
My camera and 400mm F5.6 lens are on eBay if you are interested
http://www.ebay.co.uk/itm/290891889042? ... 1555.l2649
http://www.ebay.co.uk/itm/290891889725? ... 1555.l2649